CVE-2017-6951 Explained : Impact and Mitigation

A vulnerability in the Linux kernel up to version 3.14.79 allows local users to cause a denial of service by exploiting the keyring_search_aux function.

Understanding CVE-2017-6951

This CVE involves a vulnerability in the Linux kernel that can be exploited by local users, potentially leading to a denial of service.

What is CVE-2017-6951?

The keyring_search_aux function in the Linux kernel through version 3.14.79 allows local users to trigger a denial of service via a specific system call.

The Impact of CVE-2017-6951

Exploiting this vulnerability can result in a NULL pointer dereference and OOPS, causing a denial of service on the affected system.

Technical Details of CVE-2017-6951

This section provides more technical insights into the CVE-2017-6951 vulnerability.

Vulnerability Description

The vulnerability in the Linux kernel allows local users to trigger a denial of service by making a specific system call related to the keyring_search_aux function.

Affected Systems and Versions

Affected systems: Linux kernel up to version 3.14.79
Affected users: Local users with access to the system

Exploitation Mechanism

Attackers exploit the keyring_search_aux function in the security/keys/keyring.c file.
By making a request_key system call for the "dead" type, attackers can trigger the vulnerability.

Mitigation and Prevention

Protecting systems from CVE-2017-6951 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply relevant patches provided by the Linux kernel maintainers.
Monitor system logs for any unusual activities that might indicate exploitation attempts.
Limit user privileges to reduce the impact of potential attacks.

Long-Term Security Practices

Regularly update the Linux kernel to the latest stable version to mitigate known vulnerabilities.
Implement proper access controls and user permissions to restrict unauthorized system access.

Patching and Updates

Stay informed about security advisories from the Linux kernel community and promptly apply patches to address vulnerabilities.